1241958721 has 4 divisors (see below), whose sum is σ = 1254255444. Its totient is φ = 1229662000.

The previous prime is 1241958703. The next prime is 1241958779. The reversal of 1241958721 is 1278591421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1032722496 + 209236225 = 32136^2 + 14465^2 .

It is a cyclic number.

It is not a de Polignac number, because 1241958721 - 2¹⁵ = 1241925953 is a prime.

It is a super-2 number, since 2×1241958721² = 3084922929335911682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1241953721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6148210 + ... + 6148411.

It is an arithmetic number, because the mean of its divisors is an integer number (313563861).

Almost surely, 2^1241958721 is an apocalyptic number.

It is an amenable number.

1241958721 is a deficient number, since it is larger than the sum of its proper divisors (12296723).

1241958721 is a wasteful number, since it uses less digits than its factorization.

1241958721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12296722.

The product of its digits is 40320, while the sum is 40.

The square root of 1241958721 is about 35241.4347182404. The cubic root of 1241958721 is about 1074.9024525873.

The spelling of 1241958721 in words is "one billion, two hundred forty-one million, nine hundred fifty-eight thousand, seven hundred twenty-one".